1 reply to this topic

[muralimuthu]

I want to depressurize manually a flowline to I atm having liquid at design pressure of 138 barg and at a min temperature of 250C.
That particular stream bubble point was found in Envelop utility is 60 barg.
As per my knowledge the pressure reaches from 138 barg to 60 barg will be in the form of liquid. Hence if I open blow down valve manually till 60 barg only liquid should come out. Then from 60 barg to 1 atm full of vapor will come out.
If I do this in Depressurisation Dynamics Utility, I am getting only vapor at the outlet.
More offer, if I do flashing from 138 barg to 60 barg with a help of a valve , I am getting a vapor fraction of 0.246.

Depressurising time may be taken as 60 min.
Any other method is there, to do the exact depressurization study.
Regards,
M.Murali

[JoeWong]

Minimum design temperature of 250 degC for flowline ? Is it 25 degC ?

May consider liquid depressuring in Depressurisation Dynamics Utility.